Based on the measurements you provided of your 2019 Keystone Passport 171 EXP you'll need the MORryde StepAbove RV Steps for 23-3/4" to 26-1/4" Wide Doorways # MR26RR. These steps have an entry height range of 25" - 29" and door width range of 23-3/4" - 26-1/4". I've attached a short video below where Aiden will walk you through the installation process. view full answer...